Sadly, this has been my experience on many drafting palette objects. It is never consistent so one need to be hyper vigilant when dimensioning them. I always keep my selection info palette open so I can change the scale when I see something didn't associate as it should have. One has to know their parts well to ensure they catch the errors. Another thing I do often is select all the dimensions of a drafting palette object or objects and look at the Info palette. If it reads as it should then all should be okay. If it reads blank, the they are not all the same and I enter the scale that it should be, thus changing them all en masse.